Battery Cell Terminal Sealing Structure for Heat Isolation
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Solution Overview
Problem
Heat generated at the joint between the sealing member and external component in battery cells is transferred to the electrode terminal, causing damage to other components during production and use.
Innovation Solution
The electrode terminal features a flange portion with a groove portion and a sealing member having a body and adapter portion, where the adapter portion is spaced apart from the flange portion in both axial and radial directions, reducing heat transfer to the electrode terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing member is directly connected to the electrode terminal, then current transmission is implemented, but heat generated at the joint is transferred to the electrode terminal causing damage to other components
Solution Approach 1:
The sealing member is divided into two distinct portions: a body portion that seals the groove portion of the electrode terminal, and an adapter portion that extends outward to connect to external components. This segmentation creates physical separation between the heat-generating connection point and the electrode terminal, allowing current transmission while blocking heat transfer paths.
Solution Approach 2:
The adapter portion acts as an intermediary element between the electrode terminal and external components. It serves as a thermal barrier that interrupts the direct heat conduction path from the welding joint to the electrode terminal, while still enabling electrical current transmission through its conductive material structure.
2Object-affected harmful factors
If the adapter portion protrudes from the flange portion, then heat transfer to the electrode terminal is retarded, but the structural complexity increases
Solution Approach 1:
The sealing member integrates multiple functions into a single component: the body portion provides sealing of the groove, while the adapter portion provides both thermal isolation and electrical connection capabilities. This merging eliminates the need for separate sealing elements and connection terminals, reducing overall assembly complexity despite the enhanced geometry of the sealing member itself.
Solution Approach 2:
The adapter portion serves multiple functions simultaneously: it acts as a thermal barrier to protect the electrode terminal, provides a mounting surface for external components, and conducts electrical current. This multi-functionality consolidates what would otherwise require multiple separate components, thereby managing structural complexity while achieving heat transfer reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration retards heat transfer to the electrode terminal, minimizing damage to other battery cell components and enhancing the stability of the connection between the sealing member and the electrode terminal.
Implementation Method 1
an outer end face of the adapter portion protruding from an outer end face of the flange portion and an outer end face of the body portion in the axial direction... transfer of heat to the electrode terminal is retarded
Data Source
AI summary
This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes a case, an electrode terminal, and a sealing member. The electrode terminal has an insertion portion and a flange portion connected in the axial direction, with the flange positioned outward of the insertion portion and extending beyond it in the radial direction. A groove extends along the axial direction of the terminal, with its opening on the outer face of the flange. The sealing member includes a body portion located in the groove to seal it, and an adapter portion at the end of the body portion facing away from the case. The adapter has a smaller radial dimension than the body and protrudes axially from the flange and body to allow electrical connection with an external component. This structure helps reduce heat transfer to the electrode terminal, thereby improving thermal stability and safety of the battery cell.